Triethylamine → 2-Hydroxy-N-methoxy-N-methyl-[1,1'-biphenyl]-3-carboxamide

Beteiligte Stoffe

Reaktionsschritte

2-hydroxy-3-phenylbenzoic acid (218, 3.0 g, 14 mmol) is dissolved in EtOAc (50 ml) and a few drops of DMF are added. Oxalyl chloride (2.5 ml, 1.5 eq) is added and the reaction is stirred under a dry atmosphere for 1 h. The reaction mixture is then concentrated in vacuo to yield a mixture of clear oil and white solid. This mixture is diluted with CH2Cl2 (50 ml) followed by the addition of N,O-dimethyl hydroxylamine hydrochloride (1.5 g, 1.1 eq) and triethylamine (3.9 ml, 2 eq). This mixture is stirred for 12-18 h under a dry atmosphere. Dilution of the reaction mixture with EtOAc and subsequent washing with dilute HCl and brine, followed by drying (MgSO4) and concentration in vacuo yields a mixture of reaction products. Flash chromatography (20/80 EtOAc/Hexanes) afforded N-methoxy-N-methyl-2-hydroxy-3-phenylbenzamide (219, 1.09 g) as a white solid.

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